18055473280 has 128 divisors (see below), whose sum is σ = 46762858800. Its totient is φ = 6666117120.

The previous prime is 18055473269. The next prime is 18055473281. The reversal of 18055473280 is 8237455081.

It can be written as a sum of positive squares in 8 ways, for example, as 1377300544 + 16678172736 = 37112^2 + 129144^2 .

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (18055473281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1399660 + ... + 1412500.

Almost surely, 2^18055473280 is an apocalyptic number.

18055473280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18055473280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23381429400).

18055473280 is an abundant number, since it is smaller than the sum of its proper divisors (28707385520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18055473280 is an equidigital number, since it uses as much as digits as its factorization.

18055473280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12899 (or 12861 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 43.

The spelling of 18055473280 in words is "eighteen billion, fifty-five million, four hundred seventy-three thousand, two hundred eighty".